Atomization and Sprays Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

For Online Access

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1991, Volume1

Issue 3

112 pages

Issue price - $75.00

Xianguo Li
Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1

R. S. Tankin
Northwestern University, Evanston, Illinois, USA

Isothermal swirl and nonswirl sprays are investigated experimentally in various annular air streams with and without swirling motions. Spray behavior in nonswirling airflows can be classified into three modes. In mode I, liquid flow dominates and spray characteristics an hardly affected by air flows. In mode II, both air and liquid flows are comparable in strength and initial spray angle is increased significantly, while downstream spray envelope is bent inward. In mode III, airflow completely controls spray characteristics and prevents liquid from reaching the wall. In swirling airflows, spray droplets tend to move outward toward the wall due to centrifugal effects. This greatly increases the chance of fuel droplets impinging on the wall, with adverse effects on combustion performance and pollutant emissions. Conceivably, a bluff-body-type combustor operating in mode III of outer annular air with strong swirling motion of inner annular air would be the best combination for future gas turbine combustors, especially in aircraft applications.

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